I got a 2000 1ton and at 55-60 mph im am running 1600 rpms does anyone have a geass of what gears I have?

 

im going to guess 3.73s

 

I have 3.73 with OD auto trans and turn about 1900 at 68mph

 

3.73

 

My 1999 F-250 7.3 had 3:73

 

90% of the super dutys i have seen have 3.73s

 

MY REAR END SPINS ONE WHEEL WITHOUT THE OTHER WHEEL ENGAGEING CAN I GET A KIT TO FIX THIS , LIMITED SLIP S CLIP ???

 

A truetrac or a locker of some sort

 

I have 3.73 on a 99 f350

 

My understanding is that some of the trucks came with a limited slip unit and some did not.

What are you using the truck for. Lots of paved road travel pulling trailers. I would install a limited slip unit. If you do some off road use, then I would install a detroit locker.